Hi everybody,
the connection from the Mediation Server to the PSTN is realized through a SIP Trunk. In this case, the mediation server is directly connected with the SBC by the provider.
in a Test scenario a PSTN subscriber calls the ocs user (MOC).
After the SBC has sent a PRACK request to the mediation server, the server responds with 481 and then followed with a 408 Request Time out. The PSTN caller hears a reject
tone after a while. In my opinion, the host part (ProviderDomain) in To header field could be a problem for the Mediation Server because he knows only the IP address of the SBC as the next hop but he does
not know the domain of the provider. Perhaps it would make sense that the host part in To header field the IP address or the domain of Mediation server (MyDomain) contains.
Or is my suspicion wrong and the problem lies elsewhere? May be the cause is as the RFC 3262/Section 3 it describes, and what will that mean in this case? See
SIP Trace.
PS: Outgoing Calls are working properly
OCS 2007 R2
OCS User: +331234567
PSTN User: +331234568
SBC -> OCS
----------------------------------------
Jul 9 15:44:04.761 SBC:Port sent to Mediation:5060
INVITE sip:+331234567@Mediation SIP/2.0
Via: SIP/2.0/TCP SBC:5060;branch=z9hG4bKekvubh104oa1ln671.1
To: <sip:+331234567@ProviderDomain;user=phone>
From: "01234568" <sip:+331234568@ProviderDomain;user=phone>;tag=SDtrcjc01-87d114f
Call-ID: SDtrcjc01-b3219ca979490a62819ba464f164-iikc131
CSeq: 1 INVITE
Max-Forwards: 68
Contact: <sip:01234568@SBC:5060;transport=tcp>
Date: Fri, 9 Jul 2010 15:44:04 GMT
Allow: INVITE, ACK, PRACK, CANCEL, BYE, OPTIONS, MESSAGE, NOTIFY, UPDATE, REGISTER, INFO, REFER, SUBSCRIBE
Supported: 100rel
P-Asserted-Identity: <sip:01234568@ProviderDomain>
Accept: application/sdp, application/isup, application/xml, application/dtmf-relay
Content-Type: application/sdp
Content-Length: 236
v=0
o=- 0 59079 IN IP4 SBC
s=IMSS
c=IN SBC
t=0 0
m=audio 56215 RTP/AVP 8 101 18 106
a=rtpmap:101 G726-32/8000
a=rtpmap:106 telephone-event/8000
a=sendrecv
a=ptime:20
a=sqn:0
a=cdsc: 1 image udptl t38
OCS answers with 100 Trying
----------------------------------------
OCS -> SBC
----------------------------------------
Jul 9 15:44:04.782 On SBC:Port received from Mediation:5060
SIP/2.0 183 Session Progress
FROM: "01234568"<sip:+331234568@ProviderDomain;user=phone>;tag=SDtrcjc01-87d114f
TO: <sip:+331234567@ProviderDomain;user=phone>;tag=7e3c73eab;epid=B21D0D1D2
CSEQ: 1 INVITE
CALL-ID: SDtrcjc01-b3219ca979490a62819ba464f164-iikc131
VIA: SIP/2.0/TCP SBC:5060;branch=z9hG4bKekvubh104oa1ln671.1
CONTACT: <sip:med.MyDomain:5060;transport=Tcp;maddr=IP-Mediation>
CONTENT-LENGTH: 260
CONTENT-TYPE: application/sdp; charset=utf-8
ALLOW: UPDATE
REQUIRE: 100rel
SERVER: RTCC/3.5.0.0 MediationServer
Rseq: 1
v=0
o=- 80 1 IN IP4 Mediation
s=session
c=IN IP4 Mediation
b=CT:1000
t=0 0
m=audio 63941 RTP/AVP 8 106
c=IN IP4 Mediation
a=rtcp:63941
a=label:Audio
a=rtpmap:8 PCMA/8000
a=rtpmap:106 telephone-event/8000
a=fmtp:106 0-16
a=ptime:20
SBC -> OCS
----------------------------------------
Jul 9 15:44:04.788 On SBC:Port sent to Mediation:5060
PRACK sip:med.MyDomain:5060;maddr=IP-Mediation;transport=Tcp SIP/2.0
Via: SIP/2.0/TCP SBC:5060;branch=z9hG4bKf460eq10507ovp2m1.1
To: <sip:+331234567@ProviderDomain;user=phone>;tag=7e3c73eab;epid=B21D0D1D2
From: "01234568"<sip:+331234568@ProviderDomain;user=phone>;tag=SDtrcjc01-87d114f
Call-ID: SDtrcjc01-b3219ca979490a62819ba464f164-iikc131
CSeq: 2 PRACK
Max-Forwards: 68
RAck: 1 1 INVITE
Content-Length: 0
Ocs -> SBC
----------------------------------------
Jul 9 15:44:04.790 On SBC:Port received from Mediation:5060
SIP/2.0 481 Call Leg/Transaction Does Not Exist
From: "01234568"<sip:+331234568@ProviderDomain;user=phone>;tag=SDtrcjc01-87d114f
To: <sip:+331234567@ProviderDomain;user=phone>;tag=7e3c73eab;epid=B21D0D1D2
CSEQ: 2 PRACK
CALL-ID: SDtrcjc01-b3219ca979490a62819ba464f164-iikc131
VIA: SIP/2.0/TCP SBC:5060;branch=z9hG4bKf460eq10507ovp2m1.1
CONTENT-LENGTH: 0
SERVER: RTCC/3.5.0.0 MediationServer
Ocs -> SBC
----------------------------------------
Jul 9 15:44:38.233 On SBC:Port received from Mediation:5060
SIP/2.0 408 Request Timeout
From: "01234568"<sip:+331234568@ProviderDomain;user=phone>;tag=SDtrcjc01-87d114f
To: <sip:+331234567@ProviderDomain;user=phone>;tag=7e3c73eab;epid=B21D0D1D2
CSEQ: 1 INVITE
CALL-ID: SDtrcjc01-b3219ca979490a62819ba464f164-iikc131
VIA: SIP/2.0/TCP SBC:5060;branch=z9hG4bKekvubh104oa1ln671.1
CONTENT-LENGTH: 0
SERVER: RTCC/3.5.0.0 MediationServer
Thanks in advance!
